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question_answer1) Assertion : A body can have acceleration even if its velocity is zero at a given instant of time. Reason : A body is momentarily at rest when it reverses its direction of motion.
question_answer2) Assertion : Two balls of different masses are thrown vertically upward with same speed. They will pass through their point of projection in the downward direction with the same speed. Reason : The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.
question_answer3) Assertion : If the displacement of the body is zero, the distance covered by it may not be zero. Reason : Displacement is a vector quantity and distance is a scalar quantity.
question_answer4) Assertion : The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval. Reason : Velocity is a vector quantity and speed is a scalar quantity.
question_answer5) Assertion : An object can have constant speed but variable velocity. Reason : Speed is a scalar but velocity is a vector quantity.
question_answer6) Assertion : The speed of a body can be negative. Reason : If the body is moving in the opposite direction of positive motion, then its speed is negative.
question_answer7) Assertion : The position-time graph of a uniform motion in one dimension of a body can have negative slope. Reason : When the speed of body decreases with time, the position-time graph of the moving body has negative slope.
question_answer8) Assertion : A positive acceleration of a body can be associated with a ?slowing down? of the body. Reason : Acceleration is a vector quantity.
question_answer9) Assertion : A negative acceleration of a body can be associated with a ?speeding up? of the body. Reason : Increase in speed of a moving body is independent of its direction of motion.
question_answer10) Assertion : When a body is subjected to a uniform acceleration, it always move in a straight line. Reason : Straight line motion is the natural tendency of the body.
question_answer11) Assertion : Rocket in flight is not an illustration of projectile. Reason : Rocket takes flight due to combustion of fuel and does not move under the gravity effect alone.
question_answer12) Assertion : The average speed of a body over a given interval of time is equal to the average velocity of the body in the same interval of time if a body moves in a straight line in one direction. Reason : Because in this case distance travelled by a body is equal to the displacement of the body.
question_answer13) Assertion : Position-time graph of a stationary object is a straight line parallel to time axis. Reason : For a stationary object, position does not change with time.
question_answer14) Assertion : The slope of displacement-time graph of a body moving with high velocity is steeper than the slope of displacement-time graph of a body with low velocity. Reason : Slope of displacement-time graph = Velocity of the body.
question_answer15) Assertion : Distance-time graph of the motion of a body having uniformly accelerated motion is a straight line inclined to the time axis. Reason : Distance travelled by a body having uniformly accelerated motion is directly proportional to the square of the time taken.
question_answer16) Assertion : A body having non-zero acceleration can have a constant velocity. Reason : Acceleration is the rate of change of velocity.
question_answer17) Assertion : A body, whatever its motion is always at rest in a frame of reference which is fixed to the body itself. Reason : The relative velocity of a body with respect to itself is zero.
question_answer18) Assertion : Displacement of a body may be zero when distance travelled by it is not zero. Reason : The displacement is the longest distance between initial and final position.
question_answer19) Assertion : The equation of motion can be applied only if acceleration is along the direction of velocity and is constant. Reason : If the acceleration of a body is constant then its motion is known as uniform motion.
question_answer20) Assertion : A bus moving due north takes a turn and starts moving towards east with same speed. There will be no change in the velocity of bus. Reason : Velocity is a vector-quantity.
question_answer21) Assertion : The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies. Reason : Sometimes relative velocity between two bodies is equal to difference in velocities of the two.
question_answer22) Assertion : The displacement-time graph of a body moving with uniform acceleration is a straight line. Reason : The displacement is proportional to time for uniformly accelerated motion.
question_answer23) Assertion : Velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to the time axis. Reason : In uniform motion of an object velocity increases as the square of time elapsed.
question_answer24) Assertion : A body may be accelerated even when it is moving uniformly. Reason : When direction of motion of the body is changing then body may have acceleration.
question_answer25) Assertion : A body falling freely may do so with constant velocity. Reason : The body falls freely, when acceleration of a body is equal to acceleration due to gravity.
question_answer26) Assertion : Displacement of a body is vector sum of the area under velocity-time graph. Reason : Displacement is a vector quantity.
question_answer27) Assertion : The position-time graph of a body moving uniformly is a straight line parallel to position-axis. Reason : The slope of position-time graph in a uniform motion gives the velocity of an object.
question_answer28) Assertion : The average speed of an object may be equal to arithmetic mean of individual speed. Reason : Average speed is equal to total distance travelled per total time taken.
question_answer29) Assertion : The average and instantaneous velocities have same value in a uniform motion. Reason : In uniform motion, the velocity of an object increases uniformly.
question_answer30) Assertion : The speedometer of an automobile measure the average speed of the automobile. Reason : Average velocity is equal to total displacement per total time taken.
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